The first disorder Devon researched was cystic fibrosis (CF). He learned that CF is a result of misfolded proteins being produced within the cell. When transported to their proper place in the plasma membrane, these misfolded proteins prevent salt from properly being pumped out of the cell. As a consequence, the cells swell with fluid that should instead be a part of the mucus membranes of the body. These mucus membranes become overly thick & sticky, causing many problems such as thick mucus filling the lungs. Which cellular organelle is responsible for the production of the malformed proteins?